www.digitalmars.com         C & C++   DMDScript  

digitalmars.D.bugs - Can't overload functions in different modules

reply Buchan <kbuchan xtra.co.nz> writes:
Currently it is impossible to have the compiler figure out which  
overloaded function
to call when they are defined in different modules unless you specify a  
module path,
even with aliases. ie, this code wont work: (the modules are in different  
files)

<code>
module foomod;
struct Foo {
	char[] name;
	int value;
}

char[] toString(Foo foo) {
	return name;
}

module main;
import foomod, std.string;

uint i;
Foo f;

main() {
	writefln(toString(f)); // fails if "alias std.string.toString toString"  
is defined last
	writefln(toString(i));  // fails if "alias Foo.toString toString" is  
defined last
	// Both fail if neither are defined
}

</code>

Now I know I could alias them as different symbols, but then you lose the  
whole point of overloading.

-- 
Using Opera's revolutionary e-mail client: http://www.opera.com/m2/
Nov 09 2004
parent reply "Walter" <newshound digitalmars.com> writes:
You need to have two alias declarations. The following works:

---------------- foomod.d ---------------------
module foomod;

struct Foo {
char[] name;
int value;
}

char[] toString(Foo foo) {
return foo.name;
}

----------------- test.d --------------------------
module main;
import foomod, std.string, std.stdio;

alias std.string.toString toString;
alias foomod.toString toString;

uint i;
Foo f;

void main() {
writefln(toString(f));
writefln(toString(i));
}

-----------------------------------------------------
Nov 09 2004
parent Buchan <kbuchan xtra.co.nz> writes:
On Tue, 9 Nov 2004 11:32:34 -0800, Walter <newshound digitalmars.com>  
wrote:

 You need to have two alias declarations. The following works:

 ---------------- foomod.d ---------------------
 module foomod;

 struct Foo {
 char[] name;
 int value;
 }

 char[] toString(Foo foo) {
 return foo.name;
 }

 ----------------- test.d --------------------------
 module main;
 import foomod, std.string, std.stdio;

 alias std.string.toString toString;
 alias foomod.toString toString;

 uint i;
 Foo f;

 void main() {
 writefln(toString(f));
 writefln(toString(i));
 }

 -----------------------------------------------------

huh... I swore I tried that... Whoops. (You didnt change any import stuff from 1.02, did you?) -- Using Opera's revolutionary e-mail client: http://www.opera.com/m2/
Nov 10 2004